from flask import render_template, redirect, url_for, flash, request,make_response,session
from werkzeug.urls import url_parse
from flask_login import login_user, logout_user, current_user
from app.auth import auth_bp
from app.auth.forms import LoginForm, RegistrationForm,ResetPasswordRequestForm, ResetPasswordForm
from app.models import User
from app.auth.email import send_password_reset_email
from app.ext import db
from io import BytesIO
from app.auth.verifycode import get_verify_code

@auth_bp.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('main.index'))
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if session.get('image').lower() != form.verify_code.data.lower():
            flash('验证码错误')
            return redirect(url_for('auth.login'))
        if user is None or not user.check_password(form.password.data):
            flash('请输入正确用户名和密码')
            return redirect(url_for('auth.login'))
        login_user(user, remember=form.remember_me.data)
        next_page = request.args.get('next')
        if not next_page or url_parse(next_page).netloc != '':
            next_page = url_for('main.index')
        return redirect(next_page)
    return render_template('auth/login.html', title='登录', form=form)


@auth_bp.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('main.index'))


@auth_bp.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('main.index'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data, email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash('注册成功！！！')
        return redirect(url_for('auth.login'))
    return render_template('auth/register.html', title='用户注册', form=form)


@auth_bp.route('/reset_password_request', methods=['GET', 'POST'])
def reset_password_request():
    if current_user.is_authenticated:
        return redirect(url_for('main.index'))
    form = ResetPasswordRequestForm()
    if form.validate_on_submit():
        user = User.query.filter_by(email=form.email.data).first()
        if user:
            send_password_reset_email(user)
        flash('登录邮箱点击链接来重置密码')
        return redirect(url_for('auth.login'))
    return render_template('auth/reset_password_request.html',title='重置密码', form=form)


@auth_bp.route('/reset_password/<token>', methods=['GET', 'POST'])
def reset_password(token):
    if current_user.is_authenticated:
        return redirect(url_for('main.index'))
    user = User.verify_reset_password_token(token)
    if not user:
        return redirect(url_for('main.index'))
    form = ResetPasswordForm()
    if form.validate_on_submit():
        user.set_password(form.password.data)
        db.session.commit()
        flash('你的密码已重置')
        return redirect(url_for('auth.login'))
    return render_template('auth/reset_password.html', form=form)


@auth_bp.route('/code')
def get_code():
    image, code = get_verify_code()
    # 图片以二进制形式写入
    buf = BytesIO()
    image.save(buf, 'jpeg')
    buf_str = buf.getvalue()
    # 把buf_str作为response返回前端，并设置首部字段
    response = make_response(buf_str)
    response.headers['Content-Type'] = 'image/gif'
    # 将验证码字符串储存在session中
    session['image'] = code
    return response
